Mental arithmetic training application.
If you win 10 games in a row, you will go to the next level.
level1 : 100+2, 100+5, ...
level2 : 100+51, 100+73, ...
level3 : 140+30, 120+70, ...
level4 : 147+21, 171+25, ...
level5 : 132+29, 159+17, ...
level6 : 50+70, 20+90, ...
level7 : 70+41, 90+92, ...
level8 : 39+70, 66+90, ...
level9 : 63+74, 94+14, ...
level10 : 58+74, 49+68, ...
In Japan, 7-8 years old (2nd grade)